Most of my characters are still quite young and they just don't need 6 pages of action buttons and I don't want to tie up extra keys to change pages.
Using HotkeyNet one can create a single key switch to toggle two or more pages. I've found this to be better than changing shift states using Nostromo or Saitek gamepads.
The code below will toggle Action Page 1 & 2 using F12 as the hotkey by checking and changing the state of ScrollLock.
Code:
//Change Action Page
<Hotkey ScrollLockOn F12>
<SendFocusWin>
<Key Shift 2>
<Key ScrollLock>

<Hotkey ScrollLockOff F12>
<SendFocusWin>
<Key Shift 1>
<Key ScrollLock>
You could also use this ability as a cast sequence among multiple characters. For example, the first press of F12 in the code above triggers <Key Shift 2> and the second press fires off <Key Shift 1>. But, you could use shortcuts to cast sequence maros instead so the first press would begin a cast sequence with one or more characters and the second press would begin a different cast sequence with other characters. The third press would trigger the second spell of the first sequence and so on and so on.

Freddie says that HKN can be further utilized to up the number to 8.